Re: [LTP] OOM killer, on ltp hackbench test.

[Subrata M. <su...@li...>]

On Wed, 2008-10-08 at 11:30 +0530, Veerendra wrote:
> Hi ,
> 
>     I noticed the OOM killer while running the hackbench tests in zSeries.
> The machine had  memory of 2GB and swap space of 1GB.
> While running the  'hackbench 300'  noticed this OOMs.
> 
> I used the z9 Lpar box to test this.
> It utilised the swap mem upto 500 MB, though it had upto 1GB of swap !
> 

Did you use the following ?:

hackbench01 hackbench 50 process 1000
hackbench02 hackbench 20 thread 1000

This is supposed not to throw up any error(s) or OOM.

Regards--
Subrata

> [root@veeru-s390 ~]# cat /etc/issue
> Red Hat Enterprise Linux Server release 5.2 (Tikanga)
> Kernel \r on an \m
> 
> [root@veeru-s390 ~]# uname -a
> Linux veeru-s390 2.6.18-117.el5 #1 SMP Tue Sep 30 20:27:56 CEST 2008 
> s390x s390x s390x GNU/Linux
> 
> Every 2.0s: free -mo                                                     
> Tue Oct  7 11:29:23 2008
> 
>              total       used       free     shared    buffers     cached
> Mem:          2008       1997         11          0          1          3
> Swap:         1023        484        539
> 
> 
> Oct  7 11:07:05 veeru-s390 kernel: Out of memory: Killed process 11088 
> (hackbench).
> Oct  7 11:09:46 veeru-s390 kernel: hackbench invoked oom-killer: 
> gfp_mask=0xd0, order=2, oomkilladj=0
> Oct  7 11:09:46 veeru-s390 kernel: 0000000062957ac0 0000000062957ac0 
> 0000000000000002 0000000000000000  
> Oct  7 11:09:46 veeru-s390 kernel:        0000000062957b60 
> 0000000062957ad8 0000000062957ad8 000000000003cb9e  
> Oct  7 11:09:46 veeru-s390 kernel:        0000000000005409 
> 0000000000000000 0000000000000000 000000000000000b  
> Oct  7 11:09:46 veeru-s390 kernel:        0000000000000008 
> 0000000000000000 0000000062957ac0 0000000062957b38  
> Oct  7 11:09:46 veeru-s390 kernel:        000000000025fb80 
> 0000000000016586 0000000062957ac0 0000000062957b10  
> Oct  7 11:09:46 veeru-s390 kernel: Call Trace:
> Oct  7 11:09:46 veeru-s390 kernel: ([<00000000000164de>] 
> show_trace+0x11e/0x130)
> Oct  7 11:09:46 veeru-s390 kernel:  [<000000000008817c>] 
> out_of_memory+0x94/0x264
> Oct  7 11:09:46 veeru-s390 kernel:  [<0000000000089fdc>] 
> __alloc_pages+0x280/0x314
> Oct  7 11:09:46 veeru-s390 kernel:  [<000000000008a0de>] 
> __get_free_pages+0x6e/0xa4
> Oct  7 11:09:46 veeru-s390 kernel:  [<000000000009386a>] 
> __pmd_alloc+0x32/0xd4
> Oct  7 11:09:46 veeru-s390 kernel:  [<00000000000958b8>] 
> copy_page_range+0x12c/0x618
> Oct  7 11:09:46 veeru-s390 kernel:  [<000000000003a912>] 
> copy_process+0xe5a/0x1724
> Oct  7 11:09:46 veeru-s390 kernel:  [<000000000003b250>] do_fork+0x74/0x1f4
> Oct  7 11:09:46 veeru-s390 kernel:  [<000000000001887c>] 
> sys_clone+0x50/0x60
> Oct  7 11:09:46 veeru-s390 kernel:  [<00000000000208f0>] 
> sysc_tracego+0xe/0x14
> Oct  7 11:09:46 veeru-s390 kernel:  [<0000004e5b3aa326>] 0x4e5b3aa326
> Oct  7 11:09:46 veeru-s390 kernel:  
> Oct  7 11:09:46 veeru-s390 kernel: Mem-info:
> Oct  7 11:09:46 veeru-s390 kernel: DMA per-cpu:
> Oct  7 11:09:46 veeru-s390 kernel: cpu 0 hot: high 186, batch 31 used:136
> Oct  7 11:09:46 veeru-s390 kernel: cpu 0 cold: high 62, batch 15 used:54
> Oct  7 11:09:46 veeru-s390 kernel: cpu 1 hot: high 186, batch 31 used:158
> Oct  7 11:09:46 veeru-s390 kernel: cpu 1 cold: high 62, batch 15 used:49
> Oct  7 11:09:46 veeru-s390 kernel: cpu 2 hot: high 186, batch 31 used:177
> Oct  7 11:09:46 veeru-s390 kernel: cpu 2 cold: high 62, batch 15 used:50
> Oct  7 11:09:46 veeru-s390 kernel: cpu 3 hot: high 186, batch 31 used:121
> Oct  7 11:09:46 veeru-s390 kernel: cpu 3 cold: high 62, batch 15 used:58
> Oct  7 11:09:46 veeru-s390 kernel: DMA32 per-cpu: empty
> Oct  7 11:09:46 veeru-s390 kernel: Normal per-cpu: empty
> Oct  7 11:09:46 veeru-s390 kernel: HighMem per-cpu: empty
> Oct  7 11:09:46 veeru-s390 kernel: Free pages:      194560kB (0kB HighMem)
> Oct  7 11:09:46 veeru-s390 kernel: Active:146742 inactive:588 dirty:0 
> writeback:0 unstable:0 free:48640 slab:40794 mapped-file:1 
> mapped-anon:146166 pagetables:47218
> Oct  7 11:09:46 veeru-s390 kernel: DMA free:194560kB min:5792kB 
> low:7240kB high:8688kB active:586896kB inactive:2352kB present:2097152kB 
> pages_scanned:1045101 all_unreclaimable? yes
> Oct  7 11:09:46 veeru-s390 kernel: lowmem_reserve[]: 0 0 0 0
> Oct  7 11:09:46 veeru-s390 kernel: DMA32 free:0kB min:0kB low:0kB 
> high:0kB active:0kB inactive:0kB present:0kB pages_scanned:0 
> all_unreclaimable? no
> Oct  7 11:09:46 veeru-s390 kernel: lowmem_reserve[]: 0 0 0 0
> Oct  7 11:09:46 veeru-s390 kernel: Normal free:0kB min:0kB low:0kB 
> high:0kB active:0kB inactive:0kB present:0kB pages_scanned:0 
> all_unreclaimable? no
> Oct  7 11:09:46 veeru-s390 kernel: lowmem_reserve[]: 0 0 0 0
> Oct  7 11:09:46 veeru-s390 kernel: HighMem free:0kB min:128kB low:128kB 
> high:128kB active:0kB inactive:0kB present:0kB pages_scanned:0 
> all_unreclaimable? no
> Oct  7 11:09:46 veeru-s390 kernel: lowmem_reserve[]: 0 0 0 0
> Oct  7 11:09:46 veeru-s390 kernel: DMA: 27830*4kB 10223*8kB 1*16kB 
> 1*32kB 0*64kB 1*128kB 1*256kB 0*512kB 1*1024kB 0*2048kB 0*4096kB = 194560kB
> Oct  7 11:09:46 veeru-s390 kernel: DMA32: empty
> Oct  7 11:09:46 veeru-s390 kernel: Normal: empty
> Oct  7 11:09:46 veeru-s390 kernel: HighMem: empty
> Oct  7 11:09:46 veeru-s390 kernel: 1208 pagecache pages
> Oct  7 11:09:46 veeru-s390 kernel: Swap cache: add 0, delete 0, find 
> 0/0, race 0+0
> Oct  7 11:09:46 veeru-s390 kernel: Free swap  = 0kB
> Oct  7 11:09:46 veeru-s390 kernel: Total swap = 0kB
> Oct  7 11:09:46 veeru-s390 kernel: Free swap:            0kB
> Oct  7 11:09:46 veeru-s390 kernel: 524288 pages of RAM
> Oct  7 11:09:46 veeru-s390 kernel: 10013 reserved pages
> Oct  7 11:09:46 veeru-s390 kernel: 406538 pages shared
> Oct  7 11:09:46 veeru-s390 kernel: 0 pages swap cached  
> 
>     But while running the hackbench in x86_64 , the testcase quit, 
> displaying error  "fork() (error: Cannot allocate memory) "
> 
> Regards, Veerendra C
> ________________________________________________________
> Linux Technology Center, India Software Labs, Bangalore, Ph: 080-4177 6428
> 
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